Serial: 4Q  Episode Nos. 440, 441, 442, and 443.  Title: The Face of Evil

The Doctor arrives in an alien jungle, where he meets a young warrior woman named Leela, cast out from the Tribe
of Sevateem for speaking out against an ongoing holy war being fought to free the "god" Xoanon.  He is surprised to
find that the tribe think that he is the Evil One who holds Xoanon prisoner, and he is further confused by
the face on a massive idol of the Evil One carved into a nearby mountainside, for it is his own....

This story marks the debut of Louise Jameson as Leela.

starring Tom Baker as Doctor Who and introducing Louise Jameson as Leela. Written by Chris Boucher,
Produced by Philip Hinchcliffe, and Directed by Pennant Roberts.

Originally transmitted from 1 January 1977 to 22 January 1977 on BBC1.